Soil Culture / Containing a Comprehensive View of Agriculture, Horticulture, Pomology, Domestic Animals, Rural Economy, and Agricultural Literature

by J. H. Walden

MARL.

This is one of the best distributed and most universal fertilizers. Marl proper contains nearly equal proportions of clay and lime. Sand-marl is spoken of, in which sand and lime are the main ingredients. Clay-marls are to be applied to sandy and gravelly soils, and sand-marls to clayey soils. Shell-marls are very valuable, and seldom contain clay. Marls may easily be known, even by those not at all acquainted with chemistry. Apply any mineral acid, or even very strong vinegar, and if it be a marl, an effervescence will at once be observed: this effect is produced by acid upon lime.